diff --git a/nemu/configs/defconfig b/nemu/configs/rv32_defconfig
similarity index 100%
rename from nemu/configs/defconfig
rename to nemu/configs/rv32_defconfig
diff --git a/nemu/flake.nix b/nemu/flake.nix
index 64632c6..a137c83 100644
--- a/nemu/flake.nix
+++ b/nemu/flake.nix
@@ -50,13 +50,21 @@
             libllvm
           ];
 
-          bulidPhase = ''
-            make defconfig
+          configurePhase = ''
+            echo NEMU_HOME=$NEMU_HOME
+            make -f scripts/config.mk rv32_defconfig
+          '';
+
+          buildPhase = ''
             make app
           '';
 
           installPhase = ''
-            cp 
+            make install
+          '';
+
+          checkPhase = ''
+            make test
           '';
 
           NEMU_HOME = src;
diff --git a/nemu/scripts/build.mk b/nemu/scripts/build.mk
index 55edd75..6d8c623 100644
--- a/nemu/scripts/build.mk
+++ b/nemu/scripts/build.mk
@@ -43,12 +43,12 @@ $(OBJ_DIR)/%.o: %.cc
 $(OBJ_DIR)/%.tag.c: %.y
 	@echo + YACC $<
 	@mkdir -p $(dir $@)
-	@$(YACC) $(YFLAGS) --header=$(<:.y=.h) -o $@ $<
+	@$(YACC) $(YFLAGS) --header=$(dir %)/$(<:.y=.h) -o $@ $<
 
 $(OBJ_DIR)/%.yy.c: %.l $(OBJ_DIR)/%.tag.c
 	@echo + LEX $<
 	@mkdir -p $(dir $@)
-	@$(LEX) $(LFLAGS) --header=$(<:.l=_lex.h) -o $@ $<
+	@$(LEX) $(LFLAGS) --header=$(dir %)/$(<:.l=_lex.h) -o $@ $<
 
 $(OBJ_DIR)/%.tag.o: $(OBJ_DIR)/%.tag.c
 	@echo + CC $<
diff --git a/nemu/src/monitor/sdb/filelist.mk b/nemu/src/monitor/sdb/filelist.mk
index 394a8a3..440694a 100644
--- a/nemu/src/monitor/sdb/filelist.mk
+++ b/nemu/src/monitor/sdb/filelist.mk
@@ -1,3 +1,3 @@
 SRCS-y += src/monitor/sdb/addrexp.tag.c src/monitor/sdb/addrexp.yy.c
-INC_PATH += src/monitor/sdb
+INC_PATH += $(OBJ_DIR)/src/monitor/sdb
 LFLAGS += -DYY_NO_UNPUT -DYY_NO_INPUT